138698764997 has 8 divisors (see below), whose sum is σ = 149437050840. Its totient is φ = 127970357760.

The previous prime is 138698764993. The next prime is 138698765003. The reversal of 138698764997 is 799467896831.

It can be written as a sum of positive squares in 4 ways, for example, as 735548641 + 137963216356 = 27121^2 + 371434^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 138698764997 - 2² = 138698764993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138698764993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2440472 + ... + 2496657.

It is an arithmetic number, because the mean of its divisors is an integer number (18679631355).

Almost surely, 2^138698764997 is an apocalyptic number.

It is an amenable number.

138698764997 is a deficient number, since it is larger than the sum of its proper divisors (10738285843).

138698764997 is a wasteful number, since it uses less digits than its factorization.

138698764997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4939303.

The product of its digits is 987614208, while the sum is 77.

The spelling of 138698764997 in words is "one hundred thirty-eight billion, six hundred ninety-eight million, seven hundred sixty-four thousand, nine hundred ninety-seven".