61061615011555 has 4 divisors (see below), whose sum is σ = 73273938013872. Its totient is φ = 48849292009240.

The previous prime is 61061615011543. The next prime is 61061615011627. The reversal of 61061615011555 is 55511051616016.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61061615011555 - 2⁷ = 61061615011427 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6106161501151 + ... + 6106161501160.

It is an arithmetic number, because the mean of its divisors is an integer number (18318484503468).

Almost surely, 2^{61061615011555} is an apocalyptic number.

61061615011555 is a deficient number, since it is larger than the sum of its proper divisors (12212323002317).

61061615011555 is a wasteful number, since it uses less digits than its factorization.

61061615011555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12212323002316.

The product of its (nonzero) digits is 135000, while the sum is 43.

The spelling of 61061615011555 in words is "sixty-one trillion, sixty-one billion, six hundred fifteen million, eleven thousand, five hundred fifty-five".