1620120061 has 24 divisors (see below), whose sum is σ = 1931529600. Its totient is φ = 1331069376.

The previous prime is 1620120053. The next prime is 1620120067. The reversal of 1620120061 is 1600210261.

It is not a de Polignac number, because 1620120061 - 2³ = 1620120053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620120067) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 876240 + ... + 878086.

It is an arithmetic number, because the mean of its divisors is an integer number (80480400).

Almost surely, 2^1620120061 is an apocalyptic number.

It is an amenable number.

1620120061 is a deficient number, since it is larger than the sum of its proper divisors (311409539).

1620120061 is a wasteful number, since it uses less digits than its factorization.

1620120061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061 (or 2032 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1620120061 is about 40250.7150371270. The cubic root of 1620120061 is about 1174.4893053947.

The spelling of 1620120061 in words is "one billion, six hundred twenty million, one hundred twenty thousand, sixty-one".