61345461940 has 24 divisors (see below), whose sum is σ = 147229108992. Its totient is φ = 21032729760.

The previous prime is 61345461929. The next prime is 61345461949. The reversal of 61345461940 is 4916454316.

61345461940 = 14662² + 14663² + ... + 14941².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61345461949) 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 7 ways as a sum of consecutive naturals, for example, 219090796 + ... + 219091075.

It is an arithmetic number, because the mean of its divisors is an integer number (6134546208).

Almost surely, 2^61345461940 is an apocalyptic number.

It is an amenable number.

61345461940 is an abundant number, since it is smaller than the sum of its proper divisors (85883647052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61345461940 is a wasteful number, since it uses less digits than its factorization.

61345461940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438181887 (or 438181885 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 61345461940 in words is "sixty-one billion, three hundred forty-five million, four hundred sixty-one thousand, nine hundred forty".