101571779399 has 4 divisors (see below), whose sum is σ = 104316962664. Its totient is φ = 98826596136.

The previous prime is 101571779381. The next prime is 101571779509. The reversal of 101571779399 is 993977175101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993977175101 = 85517 ⋅11623153.

It is a cyclic number.

It is not a de Polignac number, because 101571779399 - 2¹² = 101571775303 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 (101571779599) 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, 1372591577 + ... + 1372591650.

It is an arithmetic number, because the mean of its divisors is an integer number (26079240666).

Almost surely, 2^101571779399 is an apocalyptic number.

101571779399 is a deficient number, since it is larger than the sum of its proper divisors (2745183265).

101571779399 is an equidigital number, since it uses as much as digits as its factorization.

101571779399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745183264.

The product of its (nonzero) digits is 3750705, while the sum is 59.

The spelling of 101571779399 in words is "one hundred one billion, five hundred seventy-one million, seven hundred seventy-nine thousand, three hundred ninety-nine".