1251355551040 has 112 divisors (see below), whose sum is σ = 3420478230912. Its totient is φ = 427145988096.

The previous prime is 1251355551031. The next prime is 1251355551049. The reversal of 1251355551040 is 401555531521.

It is an interprime number because it is at equal distance from previous prime (1251355551031) and next prime (1251355551049).

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251355551049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 722007 + ... + 1738966.

Almost surely, 2^{1251355551040} is an apocalyptic number.

1251355551040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251355551040 is an abundant number, since it is smaller than the sum of its proper divisors (2169122679872).

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

1251355551040 is a wasteful number, since it uses less digits than its factorization.

1251355551040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2461224 (or 2461214 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 37.

The spelling of 1251355551040 in words is "one trillion, two hundred fifty-one billion, three hundred fifty-five million, five hundred fifty-one thousand, forty".