7657981601 has 4 divisors (see below), whose sum is σ = 7658180400. Its totient is φ = 7657782804.

The previous prime is 7657981589. The next prime is 7657981631. The reversal of 7657981601 is 1061897567.

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 a de Polignac number, because none of the positive numbers 2^k-7657981601 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 7657981601.

It is not an unprimeable number, because it can be changed into a prime (7657981631) 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, 21011 + ... + 125528.

It is an arithmetic number, because the mean of its divisors is an integer number (1914545100).

Almost surely, 2^7657981601 is an apocalyptic number.

It is an amenable number.

7657981601 is a deficient number, since it is larger than the sum of its proper divisors (198799).

7657981601 is a wasteful number, since it uses less digits than its factorization.

7657981601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198798.

The product of its (nonzero) digits is 635040, while the sum is 50.

The square root of 7657981601 is about 87509.8943034443. The cubic root of 7657981601 is about 1971.0823671534.

The spelling of 7657981601 in words is "seven billion, six hundred fifty-seven million, nine hundred eighty-one thousand, six hundred one".