61523166331 has 4 divisors (see below), whose sum is σ = 67116181464. Its totient is φ = 55930151200.

The previous prime is 61523166301. The next prime is 61523166337. The reversal of 61523166331 is 13366132516.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61523166331 - 2¹⁹ = 61522642043 is a prime.

It is a super-2 number, since 2×61523166331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61523166337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2796507550 + ... + 2796507571.

It is an arithmetic number, because the mean of its divisors is an integer number (16779045366).

Almost surely, 2^61523166331 is an apocalyptic number.

61523166331 is a deficient number, since it is larger than the sum of its proper divisors (5593015133).

61523166331 is a wasteful number, since it uses less digits than its factorization.

61523166331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5593015132.

The product of its digits is 58320, while the sum is 37.

Adding to 61523166331 its reverse (13366132516), we get a palindrome (74889298847).

The spelling of 61523166331 in words is "sixty-one billion, five hundred twenty-three million, one hundred sixty-six thousand, three hundred thirty-one".