25151221520000 has 80 divisors (see below), whose sum is σ = 62612394221850. Its totient is φ = 10060488576000.

The previous prime is 25151221519979. The next prime is 25151221520053. The reversal of 25151221520000 is 2512215152.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 452627546176 + 24698593973824 = 672776^2 + 4969768^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×25151221520000² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 157115135 + ... + 157275134.

Almost surely, 2^{25151221520000} is an apocalyptic number.

25151221520000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25151221520000 is an abundant number, since it is smaller than the sum of its proper divisors (37461172701850).

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

25151221520000 is an frugal number, since it uses more digits than its factorization.

25151221520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314390303 (or 314390276 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 25151221520000 its reverse (2512215152), we get a palindrome (25153733735152).

The spelling of 25151221520000 in words is "twenty-five trillion, one hundred fifty-one billion, two hundred twenty-one million, five hundred twenty thousand".