1215551451015 has 48 divisors (see below), whose sum is σ = 2326190106240. Its totient is φ = 582257557440.

The previous prime is 1215551450969. The next prime is 1215551451029. The reversal of 1215551451015 is 5101541555121.

1215551451015 is a `hidden beast` number, since 1 + 2 + 155 + 51 + 451 + 0 + 1 + 5 = 666.

It is not a de Polignac number, because 1215551451015 - 2⁷ = 1215551450887 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14752045 + ... + 14834214.

It is an arithmetic number, because the mean of its divisors is an integer number (48462293880).

Almost surely, 2^{1215551451015} is an apocalyptic number.

1215551451015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1215551451015 is a deficient number, since it is larger than the sum of its proper divisors (1110638655225).

1215551451015 is a wasteful number, since it uses less digits than its factorization.

1215551451015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29586364 (or 29586361 counting only the distinct ones).

The product of its (nonzero) digits is 25000, while the sum is 36.

The spelling of 1215551451015 in words is "one trillion, two hundred fifteen billion, five hundred fifty-one million, four hundred fifty-one thousand, fifteen".