15630999945 has 48 divisors (see below), whose sum is σ = 28982587968. Its totient is φ = 7132840960.

The previous prime is 15630999899. The next prime is 15630999947. The reversal of 15630999945 is 54999903651.

It is not a de Polignac number, because 15630999945 - 2¹⁰ = 15630998921 is a prime.

It is a super-4 number, since 4×15630999945⁴ (a number of 42 digits) contains 4444 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15630999947) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 116214 + ... + 211583.

It is an arithmetic number, because the mean of its divisors is an integer number (603803916).

Almost surely, 2^15630999945 is an apocalyptic number.

15630999945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15630999945 is a deficient number, since it is larger than the sum of its proper divisors (13351588023).

15630999945 is a wasteful number, since it uses less digits than its factorization.

15630999945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327850 (or 327833 counting only the distinct ones).

The product of its (nonzero) digits is 11809800, while the sum is 60.

The spelling of 15630999945 in words is "fifteen billion, six hundred thirty million, nine hundred ninety-nine thousand, nine hundred forty-five".