661001154 has 32 divisors (see below), whose sum is σ = 1445670720. Its totient is φ = 199819200.

The previous prime is 661001153. The next prime is 661001171. The reversal of 661001154 is 451100166.

It is not an unprimeable number, because it can be changed into a prime (661001153) 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, 15892 + ... + 39680.

It is an arithmetic number, because the mean of its divisors is an integer number (45177210).

Almost surely, 2^661001154 is an apocalyptic number.

661001154 is an abundant number, since it is smaller than the sum of its proper divisors (784669566).

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

661001154 is a wasteful number, since it uses less digits than its factorization.

661001154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24226.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 661001154 is about 25709.9427070540. The cubic root of 661001154 is about 871.0987808034.

The spelling of 661001154 in words is "six hundred sixty-one million, one thousand, one hundred fifty-four".