1551449168640 has 1512 divisors, whose sum is σ = 6671445530400. Its totient is φ = 338443370496.

The previous prime is 1551449168629. The next prime is 1551449168683. The reversal of 1551449168640 is 468619441551.

1551449168640 is a `hidden beast` number, since 1 + 5 + 51 + 4 + 491 + 68 + 6 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (1512).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 3455343136 + ... + 3455343584.

It is an arithmetic number, because the mean of its divisors is an integer number (4412331700).

Almost surely, 2^{1551449168640} is an apocalyptic number.

1551449168640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551449168640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3335722765200).

1551449168640 is an abundant number, since it is smaller than the sum of its proper divisors (5119996361760).

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

1551449168640 is an frugal number, since it uses more digits than its factorization.

1551449168640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 1551449168640 in words is "one trillion, five hundred fifty-one billion, four hundred forty-nine million, one hundred sixty-eight thousand, six hundred forty".