155620166506420 has 48 divisors (see below), whose sum is σ = 407441890493568. Its totient is φ = 48504986962560.

The previous prime is 155620166506373. The next prime is 155620166506421. The reversal of 155620166506420 is 24605661026551.

155620166506420 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155620166506421) 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, 50526026547 + ... + 50526029626.

It is an arithmetic number, because the mean of its divisors is an integer number (8488372718616).

Almost surely, 2^{155620166506420} is an apocalyptic number.

155620166506420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155620166506420 is an abundant number, since it is smaller than the sum of its proper divisors (251821723987148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155620166506420 is a wasteful number, since it uses less digits than its factorization.

155620166506420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101052056200 (or 101052056198 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 155620166506420 in words is "one hundred fifty-five trillion, six hundred twenty billion, one hundred sixty-six million, five hundred six thousand, four hundred twenty".