61156055122772 has 12 divisors (see below), whose sum is σ = 108489166279956. Its totient is φ = 30159150471360.

The previous prime is 61156055122759. The next prime is 61156055122781. The reversal of 61156055122772 is 27722155065116.

It can be written as a sum of positive squares in 2 ways, for example, as 47152997174416 + 14003057948356 = 6866804^2 + 3742066^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61156055122772.

It is a congruent 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, 104719272179 + ... + 104719272762.

It is an arithmetic number, because the mean of its divisors is an integer number (9040763856663).

Almost surely, 2^{61156055122772} is an apocalyptic number.

It is an amenable number.

61156055122772 is a deficient number, since it is larger than the sum of its proper divisors (47333111157184).

61156055122772 is a wasteful number, since it uses less digits than its factorization.

61156055122772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209438545018 (or 209438545016 counting only the distinct ones).

The product of its (nonzero) digits is 1764000, while the sum is 50.

The spelling of 61156055122772 in words is "sixty-one trillion, one hundred fifty-six billion, fifty-five million, one hundred twenty-two thousand, seven hundred seventy-two".