661764954 has 8 divisors (see below), whose sum is σ = 1323529920. Its totient is φ = 220588316.

The previous prime is 661764941. The next prime is 661764959. The reversal of 661764954 is 459467166.

It is a sphenic number, since it is the product of 3 distinct primes.

661764954 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (661764959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55147074 + ... + 55147085.

It is an arithmetic number, because the mean of its divisors is an integer number (165441240).

Almost surely, 2^661764954 is an apocalyptic number.

661764954 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

661764954 is a wasteful number, since it uses less digits than its factorization.

661764954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110294164.

The product of its digits is 1088640, while the sum is 48.

The square root of 661764954 is about 25724.7925939161. The cubic root of 661764954 is about 871.4341756489.

The spelling of 661764954 in words is "six hundred sixty-one million, seven hundred sixty-four thousand, nine hundred fifty-four".