1613245644 has 18 divisors (see below), whose sum is σ = 4077926580. Its totient is φ = 537748536.

The previous prime is 1613245639. The next prime is 1613245657. The reversal of 1613245644 is 4465423161.

1613245644 is a `hidden beast` number, since 1 + 6 + 1 + 3 + 2 + 4 + 5 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 44812379 = 1613245644 / (1 + 6 + 1 + 3 + 2 + 4 + 5 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 1613245599 and 1613245608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22406154 + ... + 22406225.

Almost surely, 2^1613245644 is an apocalyptic number.

It is an amenable number.

1613245644 is an abundant number, since it is smaller than the sum of its proper divisors (2464680936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1613245644 is a wasteful number, since it uses less digits than its factorization.

1613245644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44812389 (or 44812384 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 1613245644 is about 40165.2292910174. The cubic root of 1613245644 is about 1172.8257710932.

It can be divided in two parts, 16132 and 45644, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 1613245644 in words is "one billion, six hundred thirteen million, two hundred forty-five thousand, six hundred forty-four".