61972195077 has 48 divisors (see below), whose sum is σ = 101825371648. Its totient is φ = 36048136320.

The previous prime is 61972195069. The next prime is 61972195123. The reversal of 61972195077 is 77059127916.

It is a happy number.

61972195077 is a `hidden beast` number, since 61 + 9 + 72 + 1 + 9 + 507 + 7 = 666.

It is not a de Polignac number, because 61972195077 - 2³ = 61972195069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61972195477) 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 47 ways as a sum of consecutive naturals, for example, 42718 + ... + 354639.

Almost surely, 2^61972195077 is an apocalyptic number.

It is an amenable number.

61972195077 is a deficient number, since it is larger than the sum of its proper divisors (39853176571).

61972195077 is a wasteful number, since it uses less digits than its factorization.

61972195077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397450 (or 397447 counting only the distinct ones).

The product of its (nonzero) digits is 1666980, while the sum is 54.

It can be divided in two parts, 61972 and 195077, that added together give a square (257049 = 507²).

The spelling of 61972195077 in words is "sixty-one billion, nine hundred seventy-two million, one hundred ninety-five thousand, seventy-seven".