101778887641 has 4 divisors (see below), whose sum is σ = 102015033984. Its totient is φ = 101542741300.

The previous prime is 101778887633. The next prime is 101778887657. The reversal of 101778887641 is 146788877101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 101778887641 - 2³ = 101778887633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101778887611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118072525 + ... + 118073386.

It is an arithmetic number, because the mean of its divisors is an integer number (25503758496).

Almost surely, 2^101778887641 is an apocalyptic number.

It is an amenable number.

101778887641 is a deficient number, since it is larger than the sum of its proper divisors (236146343).

101778887641 is an equidigital number, since it uses as much as digits as its factorization.

101778887641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236146342.

The product of its (nonzero) digits is 4214784, while the sum is 58.

The spelling of 101778887641 in words is "one hundred one billion, seven hundred seventy-eight million, eight hundred eighty-seven thousand, six hundred forty-one".