61656011001555 has 16 divisors (see below), whose sum is σ = 98649773191680. Its totient is φ = 32883154004448.

The previous prime is 61656011001479. The next prime is 61656011001589. The reversal of 61656011001555 is 55510011065616.

It is not a de Polignac number, because 61656011001555 - 2²¹ = 61656008904403 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7799256 + ... + 13569834.

It is an arithmetic number, because the mean of its divisors is an integer number (6165610824480).

Almost surely, 2^{61656011001555} is an apocalyptic number.

61656011001555 is a deficient number, since it is larger than the sum of its proper divisors (36993762190125).

61656011001555 is a wasteful number, since it uses less digits than its factorization.

61656011001555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6482890.

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 61656011001555 in words is "sixty-one trillion, six hundred fifty-six billion, eleven million, one thousand, five hundred fifty-five".