661024487 has 6 divisors (see below), whose sum is σ = 672042384. Its totient is φ = 650184360.

The previous prime is 661024411. The next prime is 661024517. The reversal of 661024487 is 784420166.

It is not a de Polignac number, because 661024487 - 2²⁴ = 644247271 is a prime.

It is a super-2 number, since 2×661024487² = 873906744827226338, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661024487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661020487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85103 + ... + 92544.

It is an arithmetic number, because the mean of its divisors is an integer number (112007064).

Almost surely, 2^661024487 is an apocalyptic number.

661024487 is a deficient number, since it is larger than the sum of its proper divisors (11017897).

661024487 is an equidigital number, since it uses as much as digits as its factorization.

661024487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177769 (or 177708 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 661024487 is about 25710.3964769118. The cubic root of 661024487 is about 871.1090304621.

The spelling of 661024487 in words is "six hundred sixty-one million, twenty-four thousand, four hundred eighty-seven".