245520421520 has 80 divisors (see below), whose sum is σ = 625472877888. Its totient is φ = 88886776320.

The previous prime is 245520421457. The next prime is 245520421547. The reversal of 245520421520 is 25124025542.

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

It is a super-2 number, since 2×245520421520² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 414779 + ... + 814298.

Almost surely, 2^245520421520 is an apocalyptic number.

245520421520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245520421520 is an abundant number, since it is smaller than the sum of its proper divisors (379952456368).

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

245520421520 is a wasteful number, since it uses less digits than its factorization.

245520421520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229328 (or 1229322 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 32.

The spelling of 245520421520 in words is "two hundred forty-five billion, five hundred twenty million, four hundred twenty-one thousand, five hundred twenty".