61505026331 has 12 divisors (see below), whose sum is σ = 75312278280. Its totient is φ = 49943930400.

The previous prime is 61505026327. The next prime is 61505026343. The reversal of 61505026331 is 13362050516.

It is not a de Polignac number, because 61505026331 - 2² = 61505026327 is a prime.

It is a super-2 number, since 2×61505026331² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61505026301) 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, 33030770 + ... + 33032631.

It is an arithmetic number, because the mean of its divisors is an integer number (6276023190).

Almost surely, 2^61505026331 is an apocalyptic number.

61505026331 is a deficient number, since it is larger than the sum of its proper divisors (13807251949).

61505026331 is a wasteful number, since it uses less digits than its factorization.

61505026331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66063434 (or 66063427 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

Adding to 61505026331 its reverse (13362050516), we get a palindrome (74867076847).

The spelling of 61505026331 in words is "sixty-one billion, five hundred five million, twenty-six thousand, three hundred thirty-one".