61632391399 has 4 divisors (see below), whose sum is σ = 61702668664. Its totient is φ = 61562114136.

The previous prime is 61632391369. The next prime is 61632391411. The reversal of 61632391399 is 99319323616.

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 61632391399 - 2¹³ = 61632383207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61632391319) 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, 35137317 + ... + 35139070.

It is an arithmetic number, because the mean of its divisors is an integer number (15425667166).

Almost surely, 2^61632391399 is an apocalyptic number.

61632391399 is a deficient number, since it is larger than the sum of its proper divisors (70277265).

61632391399 is an equidigital number, since it uses as much as digits as its factorization.

61632391399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70277264.

The product of its digits is 1417176, while the sum is 52.

The spelling of 61632391399 in words is "sixty-one billion, six hundred thirty-two million, three hundred ninety-one thousand, three hundred ninety-nine".