61521412115615 has 8 divisors (see below), whose sum is σ = 73833804633408. Its totient is φ = 49211722962720.

The previous prime is 61521412115609. The next prime is 61521412115617. The reversal of 61521412115615 is 51651121412516.

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

It is not a de Polignac number, because 61521412115615 - 2⁶ = 61521412115551 is a prime.

It is a super-2 number, since 2×61521412115615² (a number of 28 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 (61521412115617) 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, 675791156 + ... + 675882185.

It is an arithmetic number, because the mean of its divisors is an integer number (9229225579176).

Almost surely, 2^{61521412115615} is an apocalyptic number.

61521412115615 is a deficient number, since it is larger than the sum of its proper divisors (12312392517793).

61521412115615 is a wasteful number, since it uses less digits than its factorization.

61521412115615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351682449.

The product of its digits is 72000, while the sum is 41.

The spelling of 61521412115615 in words is "sixty-one trillion, five hundred twenty-one billion, four hundred twelve million, one hundred fifteen thousand, six hundred fifteen".