61749614657 has 8 divisors (see below), whose sum is σ = 62919377640. Its totient is φ = 60580024960.

The previous prime is 61749614639. The next prime is 61749614687. The reversal of 61749614657 is 75641694716.

It can be written as a sum of positive squares in 4 ways, for example, as 2013855376 + 59735759281 = 44876^2 + 244409^2 .

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 61749614657 - 2¹⁸ = 61749352513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61749614617) 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, 848069 + ... + 917997.

It is an arithmetic number, because the mean of its divisors is an integer number (7864922205).

Almost surely, 2^61749614657 is an apocalyptic number.

It is an amenable number.

61749614657 is a deficient number, since it is larger than the sum of its proper divisors (1169762983).

61749614657 is a wasteful number, since it uses less digits than its factorization.

61749614657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86643.

The product of its digits is 7620480, while the sum is 56.

The spelling of 61749614657 in words is "sixty-one billion, seven hundred forty-nine million, six hundred fourteen thousand, six hundred fifty-seven".