2072602661 has 4 divisors (see below), whose sum is σ = 2074579500. Its totient is φ = 2070625824.

The previous prime is 2072602643. The next prime is 2072602691. The reversal of 2072602661 is 1662062702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2002562500 + 70040161 = 44750^2 + 8369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2072602661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2072602601) 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, 986846 + ... + 988943.

It is an arithmetic number, because the mean of its divisors is an integer number (518644875).

Almost surely, 2^2072602661 is an apocalyptic number.

It is an amenable number.

2072602661 is a deficient number, since it is larger than the sum of its proper divisors (1976839).

2072602661 is a wasteful number, since it uses less digits than its factorization.

2072602661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1976838.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 2072602661 is about 45525.8460767068. The cubic root of 2072602661 is about 1274.9858075570.

The spelling of 2072602661 in words is "two billion, seventy-two million, six hundred two thousand, six hundred sixty-one".