61081121122651 has 48 divisors (see below), whose sum is σ = 73352335104000. Its totient is φ = 50676162280128.

The previous prime is 61081121122607. The next prime is 61081121122727. The reversal of 61081121122651 is 15622112118016.

It is not a de Polignac number, because 61081121122651 - 2²⁵ = 61081087568219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61081121122651.

It is not an unprimeable number, because it can be changed into a prime (61081121122751) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3549774690 + ... + 3549791896.

It is an arithmetic number, because the mean of its divisors is an integer number (1528173648000).

Almost surely, 2^{61081121122651} is an apocalyptic number.

61081121122651 is a deficient number, since it is larger than the sum of its proper divisors (12271213981349).

61081121122651 is a wasteful number, since it uses less digits than its factorization.

61081121122651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27296 (or 27289 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 37.

The spelling of 61081121122651 in words is "sixty-one trillion, eighty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, six hundred fifty-one".