661366502 has 8 divisors (see below), whose sum is σ = 1001681616. Its totient is φ = 327472632.

The previous prime is 661366501. The next prime is 661366507. The reversal of 661366502 is 205663166.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661366501) 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, 1605053 + ... + 1605464.

It is an arithmetic number, because the mean of its divisors is an integer number (125210202).

Almost surely, 2^661366502 is an apocalyptic number.

661366502 is a deficient number, since it is larger than the sum of its proper divisors (340315114).

661366502 is a wasteful number, since it uses less digits than its factorization.

661366502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210622.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 661366502 is about 25717.0469144496. The cubic root of 661366502 is about 871.2592422379.

The spelling of 661366502 in words is "six hundred sixty-one million, three hundred sixty-six thousand, five hundred two".