155638421014 has 4 divisors (see below), whose sum is σ = 233457631524. Its totient is φ = 77819210506.

The previous prime is 155638420963. The next prime is 155638421039. The reversal of 155638421014 is 410124836551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 410124836551 = 9239 ⋅44390609.

It is a super-2 number, since 2×155638421014² (a number of 23 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 as a sum of consecutive naturals, namely, 38909605252 + ... + 38909605255.

It is an arithmetic number, because the mean of its divisors is an integer number (58364407881).

Almost surely, 2^155638421014 is an apocalyptic number.

155638421014 is a deficient number, since it is larger than the sum of its proper divisors (77819210510).

155638421014 is an equidigital number, since it uses as much as digits as its factorization.

155638421014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77819210509.

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 155638421014 in words is "one hundred fifty-five billion, six hundred thirty-eight million, four hundred twenty-one thousand, fourteen".