61863755757 has 16 divisors (see below), whose sum is σ = 84225308160. Its totient is φ = 40380602112.

The previous prime is 61863755741. The next prime is 61863755761. The reversal of 61863755757 is 75755736816.

It is a happy number.

It is not a de Polignac number, because 61863755757 - 2⁴ = 61863755741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61863755757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61863755557) 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, 1000957 + ... + 1060962.

It is an arithmetic number, because the mean of its divisors is an integer number (5264081760).

Almost surely, 2^61863755757 is an apocalyptic number.

It is an amenable number.

61863755757 is a deficient number, since it is larger than the sum of its proper divisors (22361552403).

61863755757 is a wasteful number, since it uses less digits than its factorization.

61863755757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062132.

The product of its digits is 37044000, while the sum is 60.

The spelling of 61863755757 in words is "sixty-one billion, eight hundred sixty-three million, seven hundred fifty-five thousand, seven hundred fifty-seven".