1631064666 has 48 divisors (see below), whose sum is σ = 4139704800. Its totient is φ = 423652320.

The previous prime is 1631064613. The next prime is 1631064727. The reversal of 1631064666 is 6664601361.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248941 + ... + 255408.

It is an arithmetic number, because the mean of its divisors is an integer number (86243850).

Almost surely, 2^1631064666 is an apocalyptic number.

1631064666 is an abundant number, since it is smaller than the sum of its proper divisors (2508640134).

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

1631064666 is a wasteful number, since it uses less digits than its factorization.

1631064666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504379 (or 504372 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 1631064666 is about 40386.4416110159. The cubic root of 1631064666 is about 1177.1280983451.

The spelling of 1631064666 in words is "one billion, six hundred thirty-one million, sixty-four thousand, six hundred sixty-six".