61157216061 has 24 divisors (see below), whose sum is σ = 91919992320. Its totient is φ = 39151079136.

The previous prime is 61157216027. The next prime is 61157216101. The reversal of 61157216061 is 16061275116.

It is a happy number.

61157216061 is a `hidden beast` number, since 6 + 11 + 572 + 16 + 0 + 61 = 666.

It is not a de Polignac number, because 61157216061 - 2¹³ = 61157207869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61157296061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1341541 + ... + 1386378.

It is an arithmetic number, because the mean of its divisors is an integer number (3829999680).

Almost surely, 2^61157216061 is an apocalyptic number.

It is an amenable number.

61157216061 is a deficient number, since it is larger than the sum of its proper divisors (30762776259).

61157216061 is a wasteful number, since it uses less digits than its factorization.

61157216061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2728025 (or 2728022 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 61157216061 in words is "sixty-one billion, one hundred fifty-seven million, two hundred sixteen thousand, sixty-one".