138037555564478 has 8 divisors (see below), whose sum is σ = 207070917902472. Its totient is φ = 69013916263656.

The previous prime is 138037555564459. The next prime is 138037555564541. The reversal of 138037555564478 is 874465555730831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×138037555564478² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2430723800 + ... + 2430780587.

It is an arithmetic number, because the mean of its divisors is an integer number (25883864737809).

Almost surely, 2^{138037555564478} is an apocalyptic number.

138037555564478 is a deficient number, since it is larger than the sum of its proper divisors (69033362337994).

138037555564478 is a wasteful number, since it uses less digits than its factorization.

138037555564478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4861518586.

The product of its (nonzero) digits is 1693440000, while the sum is 71.

The spelling of 138037555564478 in words is "one hundred thirty-eight trillion, thirty-seven billion, five hundred fifty-five million, five hundred sixty-four thousand, four hundred seventy-eight".