291666402664 has 32 divisors (see below), whose sum is σ = 673076315520. Its totient is φ = 115384510656.

The previous prime is 291666402619. The next prime is 291666402683. The reversal of 291666402664 is 466204666192.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200319604 + ... + 200321059.

It is an arithmetic number, because the mean of its divisors is an integer number (21033634860).

Almost surely, 2^291666402664 is an apocalyptic number.

It is an amenable number.

291666402664 is an abundant number, since it is smaller than the sum of its proper divisors (381409912856).

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

291666402664 is a wasteful number, since it uses less digits than its factorization.

291666402664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400640689 (or 400640685 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 52.

The spelling of 291666402664 in words is "two hundred ninety-one billion, six hundred sixty-six million, four hundred two thousand, six hundred sixty-four".