101578111855 has 16 divisors (see below), whose sum is σ = 133067880864. Its totient is φ = 73823380480.

The previous prime is 101578111849. The next prime is 101578111861. The reversal of 101578111855 is 558111875101.

It is an interprime number because it is at equal distance from previous prime (101578111849) and next prime (101578111861).

It is not a de Polignac number, because 101578111855 - 2⁵ = 101578111823 is a prime.

It is a super-2 number, since 2×101578111855² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 565594 + ... + 723223.

It is an arithmetic number, because the mean of its divisors is an integer number (8316742554).

Almost surely, 2^101578111855 is an apocalyptic number.

101578111855 is a deficient number, since it is larger than the sum of its proper divisors (31489769009).

101578111855 is a wasteful number, since it uses less digits than its factorization.

101578111855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290266.

The product of its (nonzero) digits is 56000, while the sum is 43.

Adding to 101578111855 its reverse (558111875101), we get a palindrome (659689986956).

The spelling of 101578111855 in words is "one hundred one billion, five hundred seventy-eight million, one hundred eleven thousand, eight hundred fifty-five".