61156507217 has 8 divisors (see below), whose sum is σ = 69735022056. Its totient is φ = 53131444992.

The previous prime is 61156507211. The next prime is 61156507253. The reversal of 61156507217 is 71270565116.

It can be written as a sum of positive squares in 4 ways, for example, as 123298816 + 61033208401 = 11104^2 + 247049^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61156507217 - 2¹⁰ = 61156506193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61156507211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138362918 + ... + 138363359.

It is an arithmetic number, because the mean of its divisors is an integer number (8716877757).

Almost surely, 2^61156507217 is an apocalyptic number.

It is an amenable number.

61156507217 is a deficient number, since it is larger than the sum of its proper divisors (8578514839).

61156507217 is a wasteful number, since it uses less digits than its factorization.

61156507217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276726307.

The product of its (nonzero) digits is 88200, while the sum is 41.

The spelling of 61156507217 in words is "sixty-one billion, one hundred fifty-six million, five hundred seven thousand, two hundred seventeen".