61982077391 has 8 divisors (see below), whose sum is σ = 66752928480. Its totient is φ = 57211654752.

The previous prime is 61982077387. The next prime is 61982077403. The reversal of 61982077391 is 19377028916.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61982077391 - 2² = 61982077387 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 (61982077301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233486 + ... + 422468.

It is an arithmetic number, because the mean of its divisors is an integer number (8344116060).

Almost surely, 2^61982077391 is an apocalyptic number.

61982077391 is a deficient number, since it is larger than the sum of its proper divisors (4770851089).

61982077391 is a wasteful number, since it uses less digits than its factorization.

61982077391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214225.

The product of its (nonzero) digits is 1143072, while the sum is 53.

Adding to 61982077391 its sum of digits (53), we get a square (61982077444 = 248962²).

The spelling of 61982077391 in words is "sixty-one billion, nine hundred eighty-two million, seventy-seven thousand, three hundred ninety-one".