621090550078 has 4 divisors (see below), whose sum is σ = 931635825120. Its totient is φ = 310545275038.

The previous prime is 621090550049. The next prime is 621090550141. The reversal of 621090550078 is 870055090126.

621090550078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 870055090126 = 2 ⋅435027545063.

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, 155272637518 + ... + 155272637521.

It is an arithmetic number, because the mean of its divisors is an integer number (232908956280).

Almost surely, 2^621090550078 is an apocalyptic number.

621090550078 is a deficient number, since it is larger than the sum of its proper divisors (310545275042).

621090550078 is a wasteful number, since it uses less digits than its factorization.

621090550078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310545275041.

The product of its (nonzero) digits is 151200, while the sum is 43.

The spelling of 621090550078 in words is "six hundred twenty-one billion, ninety million, five hundred fifty thousand, seventy-eight".