68550978877 has 4 divisors (see below), whose sum is σ = 68616957760. Its totient is φ = 68484999996.

The previous prime is 68550978851. The next prime is 68550978893. The reversal of 68550978877 is 77887905586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77887905586 = 2 ⋅38943952793.

It is a cyclic number.

It is not a de Polignac number, because 68550978877 - 2¹⁵ = 68550946109 is a prime.

It is a super-2 number, since 2×68550978877² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68550978277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32987883 + ... + 32989960.

It is an arithmetic number, because the mean of its divisors is an integer number (17154239440).

Almost surely, 2^68550978877 is an apocalyptic number.

It is an amenable number.

68550978877 is a deficient number, since it is larger than the sum of its proper divisors (65978883).

68550978877 is a wasteful number, since it uses less digits than its factorization.

68550978877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65978882.

The product of its (nonzero) digits is 237081600, while the sum is 70.

The spelling of 68550978877 in words is "sixty-eight billion, five hundred fifty million, nine hundred seventy-eight thousand, eight hundred seventy-seven".