978154661 has 8 divisors (see below), whose sum is σ = 1067396448. Its totient is φ = 888966000.

The previous prime is 978154651. The next prime is 978154679. The reversal of 978154661 is 166451879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 978154661 - 2²² = 973960357 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 (978154621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31931 + ... + 54551.

It is an arithmetic number, because the mean of its divisors is an integer number (133424556).

Almost surely, 2^978154661 is an apocalyptic number.

It is an amenable number.

978154661 is a deficient number, since it is larger than the sum of its proper divisors (89241787).

978154661 is a wasteful number, since it uses less digits than its factorization.

978154661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26563.

The product of its digits is 362880, while the sum is 47.

The square root of 978154661 is about 31275.4642011913. The cubic root of 978154661 is about 992.6645429746.

The spelling of 978154661 in words is "nine hundred seventy-eight million, one hundred fifty-four thousand, six hundred sixty-one".