661142454 has 16 divisors (see below), whose sum is σ = 1511182848. Its totient is φ = 188897832.

The previous prime is 661142437. The next prime is 661142473. The reversal of 661142454 is 454241166.

It is a super-2 number, since 2×661142454² = 874218688962284232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7870702 + ... + 7870785.

It is an arithmetic number, because the mean of its divisors is an integer number (94448928).

Almost surely, 2^661142454 is an apocalyptic number.

661142454 is an abundant number, since it is smaller than the sum of its proper divisors (850040394).

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

661142454 is a wasteful number, since it uses less digits than its factorization.

661142454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15741499.

The product of its digits is 23040, while the sum is 33.

The square root of 661142454 is about 25712.6905243306. The cubic root of 661142454 is about 871.1608470027.

The spelling of 661142454 in words is "six hundred sixty-one million, one hundred forty-two thousand, four hundred fifty-four".