61358158799 has 4 divisors (see below), whose sum is σ = 70123610064. Its totient is φ = 52592707536.

The previous prime is 61358158789. The next prime is 61358158867. The reversal of 61358158799 is 99785185316.

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

It is a cyclic number.

It is not a de Polignac number, because 61358158799 - 2²⁰ = 61357110223 is a prime.

It is a super-2 number, since 2×61358158799² (a number of 22 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 (61358158709) 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, 4382725622 + ... + 4382725635.

It is an arithmetic number, because the mean of its divisors is an integer number (17530902516).

Almost surely, 2^61358158799 is an apocalyptic number.

61358158799 is a deficient number, since it is larger than the sum of its proper divisors (8765451265).

61358158799 is an equidigital number, since it uses as much as digits as its factorization.

61358158799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8765451264.

The product of its digits is 16329600, while the sum is 62.

The spelling of 61358158799 in words is "sixty-one billion, three hundred fifty-eight million, one hundred fifty-eight thousand, seven hundred ninety-nine".