101101019978 has 12 divisors (see below), whose sum is σ = 176410963602. Its totient is φ = 43329008520.

The previous prime is 101101019977. The next prime is 101101020011. The reversal of 101101019978 is 879910101101.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 82332841969 + 18768178009 = 286937^2 + 136997^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (101101019977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 515821433 + ... + 515821628.

Almost surely, 2^101101019978 is an apocalyptic number.

101101019978 is a deficient number, since it is larger than the sum of its proper divisors (75309943624).

101101019978 is a wasteful number, since it uses less digits than its factorization.

101101019978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031643077 (or 1031643070 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 38.

The spelling of 101101019978 in words is "one hundred one billion, one hundred one million, nineteen thousand, nine hundred seventy-eight".