138820388275551 has 16 divisors (see below), whose sum is σ = 198029659437440. Its totient is φ = 86238722653920.

The previous prime is 138820388275537. The next prime is 138820388275559. The reversal of 138820388275551 is 155572883028831.

It is not a de Polignac number, because 138820388275551 - 2⁷ = 138820388275423 is a prime.

It is a super-2 number, since 2×138820388275551² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138820388275559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19962663805 + ... + 19962670758.

It is an arithmetic number, because the mean of its divisors is an integer number (12376853714840).

Almost surely, 2^{138820388275551} is an apocalyptic number.

138820388275551 is a deficient number, since it is larger than the sum of its proper divisors (59209271161889).

138820388275551 is a wasteful number, since it uses less digits than its factorization.

138820388275551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39925334646.

The product of its (nonzero) digits is 129024000, while the sum is 66.

The spelling of 138820388275551 in words is "one hundred thirty-eight trillion, eight hundred twenty billion, three hundred eighty-eight million, two hundred seventy-five thousand, five hundred fifty-one".