1215511550454 has 64 divisors (see below), whose sum is σ = 2496377180160. Its totient is φ = 394378122240.

The previous prime is 1215511550453. The next prime is 1215511550467. The reversal of 1215511550454 is 4540551155121.

It is a super-2 number, since 2×1215511550454² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215511550453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43470142 + ... + 43498094.

It is an arithmetic number, because the mean of its divisors is an integer number (39005893440).

Almost surely, 2^{1215511550454} is an apocalyptic number.

1215511550454 is an abundant number, since it is smaller than the sum of its proper divisors (1280865629706).

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

1215511550454 is a wasteful number, since it uses less digits than its factorization.

1215511550454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28845.

The product of its (nonzero) digits is 100000, while the sum is 39.

The spelling of 1215511550454 in words is "one trillion, two hundred fifteen billion, five hundred eleven million, five hundred fifty thousand, four hundred fifty-four".