61531426299 has 32 divisors (see below), whose sum is σ = 100170158080. Its totient is φ = 32813063712.

The previous prime is 61531426273. The next prime is 61531426321. The reversal of 61531426299 is 99262413516.

It is not a de Polignac number, because 61531426299 - 2¹⁵ = 61531393531 is a prime.

It is a super-2 number, since 2×61531426299² (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 (61531426259) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1124119 + ... + 1177584.

It is an arithmetic number, because the mean of its divisors is an integer number (3130317440).

Almost surely, 2^61531426299 is an apocalyptic number.

61531426299 is a deficient number, since it is larger than the sum of its proper divisors (38638731781).

61531426299 is a wasteful number, since it uses less digits than its factorization.

61531426299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301799.

The product of its digits is 699840, while the sum is 48.

The spelling of 61531426299 in words is "sixty-one billion, five hundred thirty-one million, four hundred twenty-six thousand, two hundred ninety-nine".