7977910669 has 16 divisors (see below), whose sum is σ = 8268480000. Its totient is φ = 7694144640.

The previous prime is 7977910649. The next prime is 7977910673. The reversal of 7977910669 is 9660197797.

It is a cyclic number.

It is not a de Polignac number, because 7977910669 - 2⁷ = 7977910541 is a prime.

It is a super-2 number, since 2×7977910669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7977910649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 604857 + ... + 617905.

It is an arithmetic number, because the mean of its divisors is an integer number (516780000).

Almost surely, 2^7977910669 is an apocalyptic number.

7977910669 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

7977910669 is a deficient number, since it is larger than the sum of its proper divisors (290569331).

7977910669 is a wasteful number, since it uses less digits than its factorization.

7977910669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13308.

The product of its (nonzero) digits is 9001692, while the sum is 61.

The square root of 7977910669 is about 89319.1506285186. The cubic root of 7977910669 is about 1998.1575255819.

The spelling of 7977910669 in words is "seven billion, nine hundred seventy-seven million, nine hundred ten thousand, six hundred sixty-nine".