83373778691 has 16 divisors (see below), whose sum is σ = 100899509760. Its totient is φ = 67252698240.

The previous prime is 83373778667. The next prime is 83373778693. The reversal of 83373778691 is 19687737338.

It is a de Polignac number, because none of the positive numbers 2^k-83373778691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83373778693) 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, 1378280 + ... + 1437498.

It is an arithmetic number, because the mean of its divisors is an integer number (6306219360).

Almost surely, 2^83373778691 is an apocalyptic number.

83373778691 is a deficient number, since it is larger than the sum of its proper divisors (17525731069).

83373778691 is a wasteful number, since it uses less digits than its factorization.

83373778691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71074.

The product of its digits is 32006016, while the sum is 62.

The spelling of 83373778691 in words is "eighty-three billion, three hundred seventy-three million, seven hundred seventy-eight thousand, six hundred ninety-one".