1691361252399 has 128 divisors (see below), whose sum is σ = 2867144949760. Its totient is φ = 863323743744.

The previous prime is 1691361252391. The next prime is 1691361252407. The reversal of 1691361252399 is 9932521631961.

It is an interprime number because it is at equal distance from previous prime (1691361252391) and next prime (1691361252407).

It is not a de Polignac number, because 1691361252399 - 2³ = 1691361252391 is a prime.

It is a super-2 number, since 2×1691361252399² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691361252391) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 239261037 + ... + 239268105.

It is an arithmetic number, because the mean of its divisors is an integer number (22399569920).

Almost surely, 2^{1691361252399} is an apocalyptic number.

1691361252399 is a deficient number, since it is larger than the sum of its proper divisors (1175783697361).

1691361252399 is a wasteful number, since it uses less digits than its factorization.

1691361252399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7389.

The product of its digits is 4723920, while the sum is 57.

The spelling of 1691361252399 in words is "one trillion, six hundred ninety-one billion, three hundred sixty-one million, two hundred fifty-two thousand, three hundred ninety-nine".