1615656061 has 4 divisors (see below), whose sum is σ = 1615873824. Its totient is φ = 1615438300.

The previous prime is 1615656041. The next prime is 1615656073. The reversal of 1615656061 is 1606565161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1615656061 - 2⁹ = 1615655549 is a prime.

It is a super-2 number, since 2×1615656061² = 5220689014892071442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1615656061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1615656041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97345 + ... + 112726.

It is an arithmetic number, because the mean of its divisors is an integer number (403968456).

Almost surely, 2^1615656061 is an apocalyptic number.

It is an amenable number.

1615656061 is a deficient number, since it is larger than the sum of its proper divisors (217763).

1615656061 is an equidigital number, since it uses as much as digits as its factorization.

1615656061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217762.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1615656061 is about 40195.2243556371. The cubic root of 1615656061 is about 1173.4096029017.

The spelling of 1615656061 in words is "one billion, six hundred fifteen million, six hundred fifty-six thousand, sixty-one".