61506122157655 has 16 divisors (see below), whose sum is σ = 84729509996544. Its totient is φ = 41986498246560.

The previous prime is 61506122157583. The next prime is 61506122157677. The reversal of 61506122157655 is 55675122160516.

It is not a de Polignac number, because 61506122157655 - 2¹³ = 61506122149463 is a prime.

It is a super-4 number, since 4×61506122157655⁴ (a number of 56 digits) contains 4444 as substring.

It is a congruent number.

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, 3940166581 + ... + 3940182190.

It is an arithmetic number, because the mean of its divisors is an integer number (5295594374784).

Almost surely, 2^{61506122157655} is an apocalyptic number.

61506122157655 is a deficient number, since it is larger than the sum of its proper divisors (23223387838889).

61506122157655 is a wasteful number, since it uses less digits than its factorization.

61506122157655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7880349006.

The product of its (nonzero) digits is 3780000, while the sum is 52.

The spelling of 61506122157655 in words is "sixty-one trillion, five hundred six billion, one hundred twenty-two million, one hundred fifty-seven thousand, six hundred fifty-five".