5161351644 has 48 divisors (see below), whose sum is σ = 13386858240. Its totient is φ = 1719733680.

The previous prime is 5161351627. The next prime is 5161351669. The reversal of 5161351644 is 4461531615.

5161351644 is a `hidden beast` number, since 5 + 1 + 6 + 1 + 3 + 5 + 1 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 5161351599 and 5161351608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292867 + ... + 309989.

It is an arithmetic number, because the mean of its divisors is an integer number (278892880).

Almost surely, 2^5161351644 is an apocalyptic number.

5161351644 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

5161351644 is an abundant number, since it is smaller than the sum of its proper divisors (8225506596).

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

5161351644 is a wasteful number, since it uses less digits than its factorization.

5161351644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19927 (or 19919 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 5161351644 is about 71842.5475884590. The cubic root of 5161351644 is about 1728.1753897014.

The spelling of 5161351644 in words is "five billion, one hundred sixty-one million, three hundred fifty-one thousand, six hundred forty-four".