661501516054 has 16 divisors (see below), whose sum is σ = 1045383598080. Its totient is φ = 313070567400.

The previous prime is 661501516043. The next prime is 661501516097. The reversal of 661501516054 is 450615105166.

It is a junction number, because it is equal to n+sod(n) for n = 661501515998 and 661501516016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7518354 + ... + 7605829.

It is an arithmetic number, because the mean of its divisors is an integer number (65336474880).

Almost surely, 2^661501516054 is an apocalyptic number.

661501516054 is a deficient number, since it is larger than the sum of its proper divisors (383882082026).

661501516054 is a wasteful number, since it uses less digits than its factorization.

661501516054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15125355.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 661501516054 in words is "six hundred sixty-one billion, five hundred one million, five hundred sixteen thousand, fifty-four".