68749197977 has 4 divisors (see below), whose sum is σ = 68750699136. Its totient is φ = 68747696820.

The previous prime is 68749197967. The next prime is 68749197997. The reversal of 68749197977 is 77979194786.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 68749197977 - 2⁴ = 68749197961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68749197917) 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, 679649 + ... + 774222.

It is an arithmetic number, because the mean of its divisors is an integer number (17187674784).

Almost surely, 2^68749197977 is an apocalyptic number.

It is an amenable number.

68749197977 is a deficient number, since it is larger than the sum of its proper divisors (1501159).

68749197977 is a wasteful number, since it uses less digits than its factorization.

68749197977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501158.

The product of its digits is 336063168, while the sum is 74.

The spelling of 68749197977 in words is "sixty-eight billion, seven hundred forty-nine million, one hundred ninety-seven thousand, nine hundred seventy-seven".