61252778907 has 48 divisors (see below), whose sum is σ = 94449045600. Its totient is φ = 39640430592.

The previous prime is 61252778861. The next prime is 61252778947. The reversal of 61252778907 is 70987725216.

It is a happy number.

It is not a de Polignac number, because 61252778907 - 2⁶ = 61252778843 is a prime.

It is a super-2 number, since 2×61252778907² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61252778947) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4029373 + ... + 4044545.

It is an arithmetic number, because the mean of its divisors is an integer number (1967688450).

Almost surely, 2^61252778907 is an apocalyptic number.

61252778907 is a deficient number, since it is larger than the sum of its proper divisors (33196266693).

61252778907 is a wasteful number, since it uses less digits than its factorization.

61252778907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15674 (or 15662 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 54.

The spelling of 61252778907 in words is "sixty-one billion, two hundred fifty-two million, seven hundred seventy-eight thousand, nine hundred seven".