661679403 has 32 divisors (see below), whose sum is σ = 1113219072. Its totient is φ = 339578400.

The previous prime is 661679371. The next prime is 661679413. The reversal of 661679403 is 304976166.

It is not a de Polignac number, because 661679403 - 2⁵ = 661679371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661679413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1918 + ... + 36428.

It is an arithmetic number, because the mean of its divisors is an integer number (34788096).

Almost surely, 2^661679403 is an apocalyptic number.

661679403 is a deficient number, since it is larger than the sum of its proper divisors (451539669).

661679403 is a wasteful number, since it uses less digits than its factorization.

661679403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34615.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 661679403 is about 25723.1297279316. The cubic root of 661679403 is about 871.3966218934.

The spelling of 661679403 in words is "six hundred sixty-one million, six hundred seventy-nine thousand, four hundred three".