1656978468 has 48 divisors (see below), whose sum is σ = 3926334720. Its totient is φ = 543793824.

The previous prime is 1656978461. The next prime is 1656978497. The reversal of 1656978468 is 8648796561.

It is not an unprimeable number, because it can be changed into a prime (1656978461) 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, 303063 + ... + 308481.

It is an arithmetic number, because the mean of its divisors is an integer number (81798640).

Almost surely, 2^1656978468 is an apocalyptic number.

It is an amenable number.

1656978468 is an abundant number, since it is smaller than the sum of its proper divisors (2269356252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1656978468 is a wasteful number, since it uses less digits than its factorization.

1656978468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5816 (or 5814 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 60.

The square root of 1656978468 is about 40706.0003930624. Note that the first 3 decimals coincide. The cubic root of 1656978468 is about 1183.3293097441.

The spelling of 1656978468 in words is "one billion, six hundred fifty-six million, nine hundred seventy-eight thousand, four hundred sixty-eight".