61657011655 has 16 divisors (see below), whose sum is σ = 74097555840. Its totient is φ = 49252910112.

The previous prime is 61657011653. The next prime is 61657011659. The reversal of 61657011655 is 55611075616.

It is a cyclic number.

It is not a de Polignac number, because 61657011655 - 2¹ = 61657011653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61657011653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15779212 + ... + 15783118.

It is an arithmetic number, because the mean of its divisors is an integer number (4631097240).

Almost surely, 2^61657011655 is an apocalyptic number.

61657011655 is a deficient number, since it is larger than the sum of its proper divisors (12440544185).

61657011655 is a wasteful number, since it uses less digits than its factorization.

61657011655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7758.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 61657011655 in words is "sixty-one billion, six hundred fifty-seven million, eleven thousand, six hundred fifty-five".