251201535020 has 24 divisors (see below), whose sum is σ = 527533591200. Its totient is φ = 100478639232.

The previous prime is 251201534993. The next prime is 251201535023. The reversal of 251201535020 is 20535102152.

It is a super-2 number, since 2×251201535020² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251201535023) 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, 1346816 + ... + 1521944.

It is an arithmetic number, because the mean of its divisors is an integer number (21980566300).

Almost surely, 2^251201535020 is an apocalyptic number.

251201535020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251201535020 is an abundant number, since it is smaller than the sum of its proper divisors (276332056180).

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

251201535020 is a wasteful number, since it uses less digits than its factorization.

251201535020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246857 (or 246855 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 251201535020 its reverse (20535102152), we get a palindrome (271736637172).

The spelling of 251201535020 in words is "two hundred fifty-one billion, two hundred one million, five hundred thirty-five thousand, twenty".