61929306917 has 6 divisors (see below), whose sum is σ = 63099630342. Its totient is φ = 60759051912.

The previous prime is 61929306899. The next prime is 61929306973. The reversal of 61929306917 is 71960392916.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 57255396961 + 4673909956 = 239281^2 + 68366^2 .

It is not a de Polignac number, because 61929306917 - 2¹⁸ = 61929044773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61929306977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1794608 + ... + 1828790.

It is an arithmetic number, because the mean of its divisors is an integer number (10516605057).

Almost surely, 2^61929306917 is an apocalyptic number.

It is an amenable number.

61929306917 is a deficient number, since it is larger than the sum of its proper divisors (1170323425).

61929306917 is an frugal number, since it uses more digits than its factorization.

61929306917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68419 (or 34236 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 53.

Multiplying 61929306917 by its sum of digits (53), we get a square (3282253266601 = 1811699²).

61929306917 divided by its sum of digits (53) gives a square (1168477489 = 34183²).

The spelling of 61929306917 in words is "sixty-one billion, nine hundred twenty-nine million, three hundred six thousand, nine hundred seventeen".