7661000657 has 4 divisors (see below), whose sum is σ = 7673142336. Its totient is φ = 7648858980.

The previous prime is 7661000653. The next prime is 7661000663. The reversal of 7661000657 is 7560001667.

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 7661000657 - 2² = 7661000653 is a prime.

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 7661000657.

It is not an unprimeable number, because it can be changed into a prime (7661000653) 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, 6069893 + ... + 6071154.

It is an arithmetic number, because the mean of its divisors is an integer number (1918285584).

Almost surely, 2^7661000657 is an apocalyptic number.

It is an amenable number.

7661000657 is a deficient number, since it is larger than the sum of its proper divisors (12141679).

7661000657 is a wasteful number, since it uses less digits than its factorization.

7661000657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12141678.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 7661000657 is about 87527.1424016573. The cubic root of 7661000657 is about 1971.3413573382.

The spelling of 7661000657 in words is "seven billion, six hundred sixty-one million, six hundred fifty-seven", and thus it is an aban number.