661684062 has 32 divisors (see below), whose sum is σ = 1427005440. Its totient is φ = 203332320.

The previous prime is 661684021. The next prime is 661684073. The reversal of 661684062 is 260486166.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 661684062.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60387 + ... + 70497.

It is an arithmetic number, because the mean of its divisors is an integer number (44593920).

Almost surely, 2^661684062 is an apocalyptic number.

661684062 is an abundant number, since it is smaller than the sum of its proper divisors (765321378).

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

661684062 is a wasteful number, since it uses less digits than its factorization.

661684062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10968.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 661684062 is about 25723.2202882921. The cubic root of 661684062 is about 871.3986671070.

The spelling of 661684062 in words is "six hundred sixty-one million, six hundred eighty-four thousand, sixty-two".