61372721541 has 16 divisors (see below), whose sum is σ = 88915773440. Its totient is φ = 37511339760.

The previous prime is 61372721471. The next prime is 61372721561. The reversal of 61372721541 is 14512727316.

It is not a de Polignac number, because 61372721541 - 2³⁰ = 60298979717 is a prime.

It is a super-2 number, since 2×61372721541² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61372721541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61372721561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17364595 + ... + 17368128.

It is an arithmetic number, because the mean of its divisors is an integer number (5557235840).

Almost surely, 2^61372721541 is an apocalyptic number.

It is an amenable number.

61372721541 is a deficient number, since it is larger than the sum of its proper divisors (27543051899).

61372721541 is a wasteful number, since it uses less digits than its factorization.

61372721541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34732776.

The product of its digits is 70560, while the sum is 39.

The spelling of 61372721541 in words is "sixty-one billion, three hundred seventy-two million, seven hundred twenty-one thousand, five hundred forty-one".