61716605501 has 12 divisors (see below), whose sum is σ = 63608411412. Its totient is φ = 59878368000.

The previous prime is 61716605497. The next prime is 61716605527. The reversal of 61716605501 is 10550661716.

It can be written as a sum of positive squares in 6 ways, for example, as 36339796900 + 25376808601 = 190630^2 + 159301^2 .

It is not a de Polignac number, because 61716605501 - 2² = 61716605497 is a prime.

It is a super-2 number, since 2×61716605501² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61716605551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202841 + ... + 405681.

It is an arithmetic number, because the mean of its divisors is an integer number (5300700951).

Almost surely, 2^61716605501 is an apocalyptic number.

61716605501 is the 202841-st pentagonal number.

61716605501 is the 111101-st centered decagonal number.

It is an amenable number.

61716605501 is a deficient number, since it is larger than the sum of its proper divisors (1891805911).

61716605501 is a wasteful number, since it uses less digits than its factorization.

61716605501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203104 (or 203063 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 38.

The spelling of 61716605501 in words is "sixty-one billion, seven hundred sixteen million, six hundred five thousand, five hundred one".