61431669488 has 20 divisors (see below), whose sum is σ = 136027268400. Its totient is φ = 26327858304.

The previous prime is 61431669461. The next prime is 61431669583. The reversal of 61431669488 is 88496613416.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 274248413 + ... + 274248636.

It is an arithmetic number, because the mean of its divisors is an integer number (6801363420).

Almost surely, 2^61431669488 is an apocalyptic number.

It is an amenable number.

61431669488 is an abundant number, since it is smaller than the sum of its proper divisors (74595598912).

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

61431669488 is a wasteful number, since it uses less digits than its factorization.

61431669488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548497064 (or 548497058 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 56.

The spelling of 61431669488 in words is "sixty-one billion, four hundred thirty-one million, six hundred sixty-nine thousand, four hundred eighty-eight".