1551255550 has 24 divisors (see below), whose sum is σ = 3107285496. Its totient is φ = 572771040.

The previous prime is 1551255547. The next prime is 1551255557. The reversal of 1551255550 is 555521551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551255557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1192624 + ... + 1193923.

It is an arithmetic number, because the mean of its divisors is an integer number (129470229).

Almost surely, 2^1551255550 is an apocalyptic number.

1551255550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1551255550 is an abundant number, since it is smaller than the sum of its proper divisors (1556029946).

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

1551255550 is a wasteful number, since it uses less digits than its factorization.

1551255550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386572 (or 2386567 counting only the distinct ones).

The product of its (nonzero) digits is 31250, while the sum is 34.

The square root of 1551255550 is about 39385.9816432192. The cubic root of 1551255550 is about 1157.6069248938.

The spelling of 1551255550 in words is "one billion, five hundred fifty-one million, two hundred fifty-five thousand, five hundred fifty".