661275476 has 12 divisors (see below), whose sum is σ = 1158579072. Its totient is φ = 330252888.

The previous prime is 661275473. The next prime is 661275479. The reversal of 661275476 is 674572166.

It is an interprime number because it is at equal distance from previous prime (661275473) and next prime (661275479).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661275473) 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, 92330 + ... + 99233.

It is an arithmetic number, because the mean of its divisors is an integer number (96548256).

Almost surely, 2^661275476 is an apocalyptic number.

It is an amenable number.

661275476 is a deficient number, since it is larger than the sum of its proper divisors (497303596).

661275476 is a wasteful number, since it uses less digits than its factorization.

661275476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192430 (or 192428 counting only the distinct ones).

The product of its digits is 423360, while the sum is 44.

The square root of 661275476 is about 25715.2770935878. The cubic root of 661275476 is about 871.2192689996.

The spelling of 661275476 in words is "six hundred sixty-one million, two hundred seventy-five thousand, four hundred seventy-six".