155450401521 has 8 divisors (see below), whose sum is σ = 207425789664. Its totient is φ = 103554307200.

The previous prime is 155450401499. The next prime is 155450401529. The reversal of 155450401521 is 125104054551.

It is a happy number.

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

It is not a de Polignac number, because 155450401521 - 2⁵ = 155450401489 is a prime.

It is a super-2 number, since 2×155450401521² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155450401529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19818880 + ... + 19826721.

It is an arithmetic number, because the mean of its divisors is an integer number (25928223708).

Almost surely, 2^155450401521 is an apocalyptic number.

It is an amenable number.

155450401521 is a deficient number, since it is larger than the sum of its proper divisors (51975388143).

155450401521 is a wasteful number, since it uses less digits than its factorization.

155450401521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39646911.

The product of its (nonzero) digits is 20000, while the sum is 33.

The spelling of 155450401521 in words is "one hundred fifty-five billion, four hundred fifty million, four hundred one thousand, five hundred twenty-one".