8978661975 has 12 divisors (see below), whose sum is σ = 14844721256. Its totient is φ = 4788619680.

The previous prime is 8978661953. The next prime is 8978661997. The reversal of 8978661975 is 5791668798.

It is an interprime number because it is at equal distance from previous prime (8978661953) and next prime (8978661997).

It is not a de Polignac number, because 8978661975 - 2²¹ = 8976564823 is a prime.

It is a super-2 number, since 2×8978661975² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59857672 + ... + 59857821.

Almost surely, 2^8978661975 is an apocalyptic number.

8978661975 is a deficient number, since it is larger than the sum of its proper divisors (5866059281).

8978661975 is a wasteful number, since it uses less digits than its factorization.

8978661975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119715506 (or 119715501 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 66.

The square root of 8978661975 is about 94755.8018012618. The cubic root of 8978661975 is about 2078.4386377133.

The spelling of 8978661975 in words is "eight billion, nine hundred seventy-eight million, six hundred sixty-one thousand, nine hundred seventy-five".