61722783381 has 32 divisors (see below), whose sum is σ = 98588464128. Its totient is φ = 33609663360.

The previous prime is 61722783319. The next prime is 61722783443. The reversal of 61722783381 is 18338722716.

It is an interprime number because it is at equal distance from previous prime (61722783319) and next prime (61722783443).

It is not a de Polignac number, because 61722783381 - 2²¹ = 61720686229 is a prime.

It is a super-2 number, since 2×61722783381² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61722783381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61722783581) 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, 796551 + ... + 870596.

It is an arithmetic number, because the mean of its divisors is an integer number (3080889504).

Almost surely, 2^61722783381 is an apocalyptic number.

It is an amenable number.

61722783381 is a deficient number, since it is larger than the sum of its proper divisors (36865680747).

61722783381 is a wasteful number, since it uses less digits than its factorization.

61722783381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667241.

The product of its digits is 677376, while the sum is 48.

The spelling of 61722783381 in words is "sixty-one billion, seven hundred twenty-two million, seven hundred eighty-three thousand, three hundred eighty-one".