61655720135 has 8 divisors (see below), whose sum is σ = 76538135520. Its totient is φ = 47623728544.

The previous prime is 61655720129. The next prime is 61655720141. The reversal of 61655720135 is 53102755616.

It is an interprime number because it is at equal distance from previous prime (61655720129) and next prime (61655720141).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-61655720135 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61655720092 and 61655720101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212605787 + ... + 212606076.

It is an arithmetic number, because the mean of its divisors is an integer number (9567266940).

Almost surely, 2^61655720135 is an apocalyptic number.

61655720135 is a deficient number, since it is larger than the sum of its proper divisors (14882415385).

61655720135 is a wasteful number, since it uses less digits than its factorization.

61655720135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425211897.

The product of its (nonzero) digits is 189000, while the sum is 41.

The spelling of 61655720135 in words is "sixty-one billion, six hundred fifty-five million, seven hundred twenty thousand, one hundred thirty-five".