661023275 has 48 divisors (see below), whose sum is σ = 921369600. Its totient is φ = 466329600.

The previous prime is 661023269. The next prime is 661023301. The reversal of 661023275 is 572320166.

It is not a de Polignac number, because 661023275 - 2¹⁰ = 661022251 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2571947 + ... + 2572203.

It is an arithmetic number, because the mean of its divisors is an integer number (19195200).

Almost surely, 2^661023275 is an apocalyptic number.

661023275 is a deficient number, since it is larger than the sum of its proper divisors (260346325).

661023275 is a wasteful number, since it uses less digits than its factorization.

661023275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 661023275 is about 25710.3729066694. The cubic root of 661023275 is about 871.1084980638.

The spelling of 661023275 in words is "six hundred sixty-one million, twenty-three thousand, two hundred seventy-five".